Split rename and merge logic for duplicate classes

[tefra]

📒 Description

Extract merge duplicate classes handler from the rename duplicate handler, because at the moment it's missing a lot of valid cases.

Resolves #xxxx

🔗 What I've Done

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💬 Comments

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🛫 Checklist

• Updated docs
• Added unit-tests
• Sample tests pass
• W3C tests pass

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.94%. Comparing base (bb0f69c) to head (2317ca7).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1127      +/-   ##
==========================================
+ Coverage   99.87%   99.94%   +0.07%     
==========================================
  Files         115      116       +1     
  Lines        9321     9356      +35     
  Branches     1419     1428       +9     
==========================================
+ Hits         9309     9351      +42     
+ Misses          8        5       -3     
+ Partials        4        0       -4     

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